Cutter-head for suction-dredges.



N5. 895,138. i I PATENTED AUG. 4, 1908.

' f B. A. ANDERSON.

CUTTER HEAD FOR SUCTION DREDGES.

. APPLI-OATION FILED M516! 1908. i 1: g

WITNESSES: INVENTOR,

" UNITED STATES PATENT OFFICE.

CUTTER-HAD FOB SUGTION-DREDGES.

To all 11:72am 1' 1 ma 3 concern.

Beit known that I, Bmonn A. Axncnsox, a citizen of Sweden, residing atSan Francisco, in the county of San Francisco and 5 State of California,have invented new and useful Improvements in Cutter-Heads forSuction-Dredges, of which the following is a specification.

The. object of the present invention is to provide an improved form ofcutter head for suction dredges of such construction as to reduce thecost of repairs and replacement. In the accompanying drawing, Figure 1is an axial section of my improved cutter head; Fig. 2 is an enlargedsection on the line 22 of Fig. 1; Fig. 3 is a top plan view of one ofthe protector plates; Fig. 4 is a perspective .view of the same; Fig. 5is an enlarged sectional view on the line 55 of Fig. 4.

'20 Referring to the drawing, 1 indicates the hub of the cutter adaptedto be secured in the usual manner upon a rotary stem, and. from whichextend radial arms 2. Upon the ends of these arms are formed obliquecutter holders 3 for securing therein the teeth 4. Said teeth are formedwith tapering shanks 5 which are driven into correspondingly taperingsockets 6 in the cutter holders.

Heretol'ore, so far as my knowledge e.\' tends, the practice has been toprovide these sockets in the form of perforations through the holders,that is, with their walls extending ent rely around the sockets,integral with the cutter holder. The ends of said holders, especiallythose at the narrow or advancing end of the cutter head, undergo greatwear, so that, by use, said ends, in front of the sockets of theforemost teeth, become completely worn away. 'hen this occurs, the '40cutter head is wholly useless, and must be "discarded.

The object of the present invention is to save this waste of materialand labor.

Iirmy invention, said sockets are recessed in the outer sides of saidholders, and the outer walls of the sockets are formed for each holder,by a protector plate 7. Said protector plate is formed with terminalportions 8 which are bent inwards, or at right angles to the generaldirection of the protector plate to form the end walls of the outermostsockets, and are then bent back \a-gain towards each other, or into aplane parallel with the general direction of the protector plate, as siown at 9, to engage the inner or under side of the holder. EachSpecification of Letters Patent. Application filed May 6, 1908. SerialNo. 431,268.

Patented Aug. 4, 1908.

protector plate is also formed with screw roles l0 tu'ough which screws11 can be screwed into the outer side of the holder between two of saidsockets.

As shown in Fig. 5, the space between'the main portion of the protectorplate and the inwardly bent portion 9 thereof is tapering or wedgeshaped; hence the side of said protector plate at the wide ends of saidspaces is first passed over the side of the holder, and

the )late is then wedged sidewise firmly on the holder. It is thensecured in place by means of the screws 11.

The sockets for the teeth are thus formed with precisely the sametapering configuration as in the old style of cutter head, but myimproved cutter head has the advantage that the wear takes placeentirely upon the ends of the protector plates, so that, when saidprotector plates are worn out, they can be replaced by new ones, and thecutter head is. then as good asnew, thereby ell'ecting a great savinginthe expense of maintenance.

I claim:

1. A cutter head having cutter holders formed with sockets, teeth insaid sockets, and protector plates secured over the ends of said cutterholders, substantially as described.

2. A cutter head, the holders of which are recessed on their outer sidesto form sockets for teeth, teeth in said sockets and protector platescovering said recesses on their outer sides, and also extending aroundthe ends of the holders to rotect said ends, substantially as describet3. A cutter head having holders formed with recesses in their outersides to provide sockets for cutter teeth, teeth in said sockets, and aprotector plate for each holder, closin the outer sides of saidrecesses, their termintfi portions being bent inwards, at rightangles tothe general direction of the protector plate, and then bent back againtowards each other but at greater distance from said protector plate atone side than at the other, to form tapering spaces between saidprotector late and its inwardly bent ends, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

BIRGER A. ANDERSON. "itnesses Fnaxcrs M- ll'men'r, D. B. RICHARDS.

